Thanks blackshire, an intense search of "Peter Alway" turned up the first paint scheme (the one in the photos above) that I've seen. Looks to be black and bare metal with those two white side pods, whatever they may be. This is about what I'm looking at:

Composited from a scale drawing, the above photo and a very, very small preview image from P.A.'s supplement.

I think I'll reserve the Arca's "corporate scheme" for some time down the road—should I ever build one. The Arcon scheme is uninspired, but it looks fairly industrial.

On a side note: I find it curious that a sounding rocket as small, unsuccessful and as little used as the Arcon, should live on, almost continuously, as a model rocket. Very odd.